package com.k12.app.utils;

import lombok.Data;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.*;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.stereotype.Component;
import org.springframework.util.CollectionUtils;

import javax.annotation.Resource;
import java.util.*;
import java.util.concurrent.TimeUnit;

@Slf4j
@Component
@Data
public class RedisUtil {

    @Resource
    private  RedisTemplate<String, Object> redisTemplate;

    private   RedisTemplate<String, String> stringRedisTemplate;
    @Autowired
    public void setStringRedisTemplate(RedisTemplate<String, String> stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    // ============================== common ==============================
    /**
     * 普通缓存获String
     * @param key 键
     * @return 值
     */
    public String getStr(String key) {
        return key == null ? null : stringRedisTemplate.opsForValue().get(key);
    }

    /**
     * 普通缓存放入
     * @param key   键
     * @param value 值string
     * @return true成功 false失败
     */
    public boolean setStr(String key, String value) {
        try {
            stringRedisTemplate.opsForValue().set(key, value);
            return true;
        } catch (Exception e) {
            log.error("Redis set error, key: {}", key, e);
            return false;
        }
    }


    /**
     * 指定缓存失效时间
     * @param key  键
     * @param time 时间(秒)
     */
    public boolean expire(String key, long time) {
        try {
            if (time > 0) {
                redisTemplate.expire(key, time, TimeUnit.SECONDS);
            }
            return true;
        } catch (Exception e) {
            log.error("Redis expire error, key: {}", key, e);
            return false;
        }
    }

    /**
     * 根据key 获取过期时间
     * @param key 键 不能为null
     * @return 时间(秒) 返回0代表为永久有效
     */
    public long getExpire(String key) {
        return redisTemplate.getExpire(key, TimeUnit.SECONDS);
    }

    /**
     * 判断key是否存在
     * @param key 键
     * @return true 存在 false不存在
     */
    public boolean hasKey(String key) {
        try {
            Boolean exists = redisTemplate.hasKey(key);
            return exists != null && exists;
        } catch (Exception e) {
            log.error("Redis hasKey error, key: {}", key, e);
            return false;
        }
    }


    /**
     * 删除缓存
     * @param key 可以传一个值 或多个
     */
    @SuppressWarnings("unchecked")
    public void del(String... key) {
        if (key != null && key.length > 0) {
            if (key.length == 1) {
                redisTemplate.delete(key[0]);
            } else {
                redisTemplate.delete((Collection<String>) CollectionUtils.arrayToList(key));
            }
        }
    }

    // ============================ String =============================

    /**
     * 普通缓存获取
     * @param key 键
     * @return 值
     */
    public Object get(String key) {
        return key == null ? null : redisTemplate.opsForValue().get(key);
    }

    /**
     * 普通缓存放入
     * @param key   键
     * @param value 值
     * @return true成功 false失败
     */
    public boolean set(String key, Object value) {
        try {
            redisTemplate.opsForValue().set(key, value);
            return true;
        } catch (Exception e) {
            log.error("Redis set error, key: {}", key, e);
            return false;
        }
    }

    /**
     * 普通缓存放入并设置时间
     * @param key   键
     * @param value 值
     * @param time  时间(秒) time要大于0 如果time小于等于0 将设置无限期
     * @return true成功 false 失败
     */
    public boolean set(String key, Object value, long time) {
        try {
            if (time > 0) {
                redisTemplate.opsForValue().set(key, value, time, TimeUnit.SECONDS);
            } else {
                set(key, value);
            }
            return true;
        } catch (Exception e) {
            log.error("Redis set with expire error, key: {}", key, e);
            return false;
        }
    }

    /**
     * 递增
     * @param key   键
     * @param delta 要增加几(大于0)
     */
    public long incr(String key, long delta) {
        if (delta < 0) {
            throw new RuntimeException("递增因子必须大于0");
        }
        Long result = redisTemplate.opsForValue().increment(key, delta);
        return result == null ? 0L : result;
    }
    /**
     * 递减
     * @param key   键
     * @param delta 要减少几(小于0)
     */
    public long decr(String key, long delta) {
        if (delta < 0) {
            throw new RuntimeException("递减因子必须大于0");
        }
        return redisTemplate.opsForValue().increment(key, -delta);
    }

    // ================================ Hash =================================

    /**
     * HashGet
     * @param key  键 不能为null
     * @param item 项 不能为null
     * @return 值
     */
    public Object hget(String key, String item) {
        return redisTemplate.opsForHash().get(key, item);
    }

    /**
     * 获取hashKey对应的所有键值
     * @param key 键
     * @return 对应的多个键值
     */
    public Map<Object, Object> hmget(String key) {
        return redisTemplate.opsForHash().entries(key);
    }

    /**
     * HashSet
     * @param key 键
     * @param map 对应多个键值
     * @return true 成功 false 失败
     */
    public boolean hmset(String key, Map<String, Object> map) {
        try {
            redisTemplate.opsForHash().putAll(key, map);
            return true;
        } catch (Exception e) {
            log.error("Redis hmset error, key: {}", key, e);
            return false;
        }
    }

    /**
     * HashSet 并设置时间
     * @param key  键
     * @param map  对应多个键值
     * @param time 时间(秒)
     * @return true成功 false失败
     */
    public boolean hmset(String key, Map<String, Object> map, long time) {
        try {
            redisTemplate.opsForHash().putAll(key, map);
            if (time > 0) {
                expire(key, time);
            }
            return true;
        } catch (Exception e) {
            log.error("Redis hmset with expire error, key: {}", key, e);
            return false;
        }
    }

    // ================================ List =================================

    /**
     * 获取list缓存的内容
     * @param key   键
     * @param start 开始
     * @param end   结束 0 到 -1代表所有值
     */
    public List<String> lGet(String key, long start, long end) {
        try {
            return stringRedisTemplate.opsForList().range(key, start, end);
        } catch (Exception e) {
            log.error("Redis lGet error, key: {}", key, e);
            return null;
        }
    }

    /**
     * 将list放入缓存
     * @param key   键
     * @param value 值
     */
    public boolean lSet(String key, Object value) {
        try {
            redisTemplate.opsForList().rightPush(key, value);
            return true;
        } catch (Exception e) {
            log.error("Redis lSet error, key: {}", key, e);
            return false;
        }
    }



    /**
     * 将list放入缓存 list集合
     * @param key   键
     * @param value 值
     */
    public void lStrSet(String key, String value) {
        try {
            stringRedisTemplate.opsForList().rightPush(key, value);
        } catch (Exception e) {
            log.error("Redis lSet error, key: {}", key, e);
        }
    }
    // ================================ Set =================================

    /**
     * 根据key获取Set中的所有值
     * @param key 键
     */
    public Set<Object> sGet(String key) {
        try {
            return redisTemplate.opsForSet().members(key);
        } catch (Exception e) {
            log.error("Redis sGet error, key: {}", key, e);
            return null;
        }
    }

    /**
     * 将数据放入set缓存
     * @param key    键
     * @param values 值 可以是多个
     * @return 成功个数
     */
    public long sSet(String key, Object... values) {
        try {
            return redisTemplate.opsForSet().add(key, values);
        } catch (Exception e) {
            log.error("Redis sSet error, key: {}", key, e);
            return 0;
        }
    }

    // ================================ ZSet =================================

    /**
     * 向ZSet添加元素
     * @param key   键
     * @param value 值
     * @param score 分数
     */
    public boolean zAdd(String key, Object value, double score) {
        try {
            return redisTemplate.opsForZSet().add(key, value, score);
        } catch (Exception e) {
            log.error("Redis zAdd error, key: {}", key, e);
            return false;
        }
    }

    // ================================ Lock =================================

    /**
     * 尝试获取分布式锁
     * @param lockKey    锁
     * @param requestId  请求标识
     * @param expireTime 超期时间(秒)
     * @return 是否获取成功
     */
    public boolean tryLock(String lockKey, String requestId, long expireTime) {
        try {
            return redisTemplate.opsForValue().setIfAbsent(lockKey, requestId, expireTime, TimeUnit.SECONDS);
        } catch (Exception e) {
            log.error("Redis tryLock error, lockKey: {}", lockKey, e);
            return false;
        }
    }

    /**
     * 释放分布式锁
     * @param lockKey   锁
     * @param requestId 请求标识
     * @return 是否释放成功
     */
    public boolean releaseLock(String lockKey, String requestId) {
        String script = "if redis.call('get', KEYS[1]) == ARGV[1] then return redis.call('del', KEYS[1]) else return 0 end";
        DefaultRedisScript<Long> redisScript = new DefaultRedisScript<>(script, Long.class);
        try {
            Long result = redisTemplate.execute(redisScript, Collections.singletonList(lockKey), requestId);
            return result != null && result == 1;
        } catch (Exception e) {
            log.error("Redis releaseLock error, lockKey: {}", lockKey, e);
            return false;
        }
    }
}